I have considered that, but I don't buy it for one moment. Open plan offices have many advantages, you just need to hire people that are mature enough to deal with it. People who can self regulate. I don't mind some time spent on FB and HN etc, I think the latter is actually a net-positive, there are technologies that osmotically people become familiar with through reading about people's experiences. But FB is 100% a waste of time. Corporate IT don't block it, they just measure it and provide management reports on it's usage.